source: imaps-frontend/node_modules/object-keys/index.js

'use strict';

var slice = Array.prototype.slice;
var isArgs = require('./isArguments');

var origKeys = Object.keys;
var keysShim = origKeys ? function keys(o) { return origKeys(o); } : require('./implementation');

var originalKeys = Object.keys;

keysShim.shim = function shimObjectKeys() {
        if (Object.keys) {
                var keysWorksWithArguments = (function () {
                        // Safari 5.0 bug
                        var args = Object.keys(arguments);
                        return args && args.length === arguments.length;
                }(1, 2));
                if (!keysWorksWithArguments) {
                        Object.keys = function keys(object) { // eslint-disable-line func-name-matching
                                if (isArgs(object)) {
                                        return originalKeys(slice.call(object));
                                }
                                return originalKeys(object);
                        };
                }
        } else {
                Object.keys = keysShim;
        }
        return Object.keys || keysShim;
};

module.exports = keysShim;